NO S5 poweroff with nfsroot (works with same kernel and same rootfs on local storage)

Hello,

I'm running Linux version 2.6.36.1 on an LFS (linuxfromscratch)-based distro. and am trying to get the host (AMD-athlon) to physically remove power (S5) on a 'halt -n -d -f -p' command issued from runstate "init 1" from an NFS rootfs (and yes the eth0 rootfs mount is still up in my run-level 1).

The results are the kernel code is entered, the "md" device is shutdown, and the following:

pci 0000:00:07.0: wake-up cabability enabled by ACPI
ACPI: Preparing to enter system sleep state S5 Disabling non-boot CPU's
SMP alternatives: switching to UP code

Then it hangs, though after a few minutes, I still get some NFS timeout messages, though I can't tell which mount, probably the rootfs?

'reboot -n -d -f' does reset the machine from the same state.

The reason I'm posting this here is because when I run the SAME kernel and the SAME rootfs from a local disk (/dev/sda1), the system does power-off successfully. I have some custom tweaks to the rc-scripts to allow running identical rootfs over NFS and local disk, but I try to rule out any runtime differences by restricting my question to run-level 1.

Both BIOS and kernel support ACPI and I've fixed the rootfs to run in r/o mode, and made some other customizations to allow proper shutdown for nfsroot, but to rule out all non-interesting things, I run the halt -n -d -f -p command from run-level 1, and I've even run some manual commands to kill off every process and every mount that was still around. Obviously I can't kill the root mount over NFS and eth0 is still up.

Is this supported or is the root cause between the keyboard and the chair?

Thanks,
John Z. Bohach